Removed specific version dependency for protobuf
Removed specific version dependency for protobuf


Former-commit-id: b3d51c4cfd1d04b0992af86ff91152a39de4d0b0
basho/riak-dotnet-client,rob-somerville/riak-dotnet-client,basho/riak-dotnet-client,rob-somerville/riak-dotnet-client